hwmon/l3g4200d_poll.c: extends device enable delay

hwmon/l3g4200d_poll.c: extends device enable delay

BZ: 29384

The l3g4200d gyro sensor needs longer
delay after enable to generate stable data
in CTP_PR0 devices. This patch add a
longer delay after device enable.

Change-Id: I9bbf375ac301ae1072ba17afee440d69f1cbc78a
Signed-off-by: jli127 <jian.d.li@intel.com>
Reviewed-on: http://android.intel.com:8080/41608
Reviewed-by: Yan, Leo <leo.yan@intel.com>
Reviewed-by: Du, Alek <alek.du@intel.com>
Tested-by: Wang, Zhifeng <zhifeng.wang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>